You can either leave the date blank, or set the date for 4/18/18. The IRS has extended the date to pay and file by one day, so it will still be on time if dated for tomorrow.
For more information please refer to the article I am including below.
https://www.irs.gov/newsroom/irs-provides-additional-day-to-file-and-pay-for-taxpayers-through-wedne...
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